You need to have Birth by Sleep (Japanese) save file with various Trophies unlocked This does not work with Birth by Sleep (English) save!

So the easiest way in getting this save is basically download a BBS-J Hundo file you will get all the trophies you need to start the NG+ with each trophy you transfer the player will get these items

Step trophy - Break time Battle trophy - Aerial slam Time trophy - Stopga, slow Arena trophy - 1000 medal Ice trophy - Freeze Munnies trophy - 1000 munnies Clear trophy - Rythm mixer Trinity trohpy - Trinity limit